php-doc-en/reference/array/functions/array-intersect-uassoc.xml

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  <refentry id="function.array-intersect-uassoc">
   <refnamediv>
    <refname>array_intersect_uassoc</refname>
    <refpurpose>Computes the intersection of arrays with additional index check, compares indexes by a callback function</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
    <methodsynopsis>
     <type>array</type><methodname>array_intersect_uassoc</methodname>
     <methodparam><type>array</type><parameter>array1</parameter></methodparam>
     <methodparam><type>array</type><parameter>array2</parameter></methodparam>
     <methodparam choice="opt"><type>array</type><parameter> ...</parameter></methodparam>
     <methodparam><type>callback</type><parameter>key_compare_func</parameter></methodparam>
    </methodsynopsis>
    <para>
     <function>array_intersect_uassoc</function> returns an array
     containing all the values of <parameter>array1</parameter>
     that are present in all the arguments. Note that the keys are used in
     the comparison unlike in <function>array_intersect</function>.
    </para>
    <para>
     The index comparison is done by a user supplied callback function.
     It must return an integer less than, equal to, or greater than zero
     if the first argument is considered to be respectively less than,
     equal to, or greater than the second.
    </para>
    <para>
     <example>
      <title><function>array_intersect_uassoc</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");

print_r(array_intersect_uassoc($array1, $array2, "strcasecmp"));
?>
]]>
      </programlisting>
      <para>
       Result will look like:
      </para>
      <screen>
<![CDATA[
Array
(
    [b] => brown
)
]]>
      </screen>
     </example>
    </para>
    <para>
     See also <function>array_intersect</function>,
     <function>array_intersect_assoc</function>,
     <function>array_uintersect_assoc</function>,
     <function>array_uintersect_uassoc</function>,
     <function>array_intersect_key</function> and
     <function>array_intersect_ukey</function>.
    </para>
   </refsect1>
  </refentry>

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